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作者： Dhruvinkumar Pa , Kurtis T. James , Martin O’Toole, , Guandong Zhang , Robert S. Keynton , André M. Gobin

Department of Bioengineering, University of Louisville, Louisville, KY 40292, United States

 

摘要：

Hypothesis

A facile, dialysis-based synthesis of stable near infrared (nIR) absorbing plasmonic gold nanoparticles (λmax = 650–1000 nm) will increase the yield of nIR particles and reduce the amount of gold colloid contaminant in the product mixture.

 

Experiments

Chloroauric acid and sodium thiosulfate were reacted using a dialysis membrane as a reaction vessel. Product yield and composition was determined and compared to traditional synthesis methods. The product particle distribution, yield, and partitioning of gold between dispersed product and membrane-adsorbed gold were determined.

 

Findings

The synthesis results in polydisperse particle suspensions comprised of 70% spheroid-like particles, 27% triangular plates, and 3% rod-like structures with a 3% batch-to-batch variation and a prominent nIR absorption band with λmax = 650–1000 nm. The amount of small gold colloid (λmax = 530 nm; d < 10 nm) in the isolated product was reduced by 96% compared to traditional methods. Additionally, 91.1% of the gold starting material is retained in the solution-based nanoparticle mixture while 8.2% is found on the dialysis membrane. The synthesis results in a quality ratio (QR = AbsnIR/Abs530) of 1.7–2.4 (twice that of previous techniques) and 14.3 times greater OD∗ml yield of the nIR-absorbing nanoparticle fraction.

 

關鍵詞：Gold nanoparticles; Near infrared; Synthesis; Coating; Dialysis; DiaSynth